What is Pmon process?

Process Monitor Process (PMON) The process monitor (PMON) performs process recovery when a user process fails. PMON is responsible for cleaning up the database buffer cache and freeing resources that the user process was using.

What is DB process?

Combine record retrieval and looping functions into one call. DB-PROCESS provides a built-in loop structure to process records and rows. The loop structure can include blocks of user-supplied logic and AMB-generated control fields.

What is m00 process in Oracle?

Symptoms. M000 background process generates a trace file at database startup, related to PGA sizing. The trace file contains information related to process memory, similar to the following: Note the allocation of 384MB for qesmmCheckPgaL in the above.

What is MMON process in Oracle?

The manageability monitor process (MMON) performs many tasks related to the Automatic Workload Repository (AWR). For example, MMON writes when a metric violates its threshold value, taking snapshots, and capturing statistics value for recently modified SQL objects.

What is PGA and SGA?

SGA (System Global Area) PGA (Program or Process Global Area) It is a memory area assigned at the time of an instance start up. It is a memory area that conserve the information regarding the user session.

What is Pmon and Smon in Oracle?

PMON and SMON are two required background processes. PMON is the Process Monitor which is responsible for recovering processes when the user process fails. PMON does the process cleanup. SMON is the System Monitor which is responsible for recovering the system after a failure.

What is Smon and Pmon in Oracle?

What is background process in dataguard?

In this post let us understand the Oracle dataguard Architecture and processes with the help of diagrams. LNS process of primary database captures redo from redo log buffer. Send it to RFS process of standby database through oracle net. RFS process then writes that redo information to standby redo log files.

How do I restart the MMON process?

Follow below steps to restart the MMON process:

  1. Grant restricted session to public: This grant is required to avoid any impact on the sessions connecting to database.
  2. Enable and disable restricted sessions.
  3. Revoke the restricted session: revoke restricted session from public;
  4. Check MMON process; ps -ef | grep mmon.

What are Oracle background processes?

The background processes consolidate functions that would otherwise be handled by multiple Oracle Database programs running for each user process. They monitor other Oracle Database processes to provide increased parallelism for better performance and reliability.

What is Pga_aggregate_limit and Pga_aggregate_target?

By default, PGA_AGGREGATE_LIMIT is set to the greater of 2 GB, 200% of PGA_AGGREGATE_TARGET , and 3 MB times the PROCESSES parameter. It will be set below 200% of PGA_AGGREGATE_TARGET if it is larger than 90% of the physical memory size minus the total SGA size, but not below 100% of PGA_AGGREGATE_TARGET .